Combination-clamp.



S. BULLUM.

COMBINATION CLAMP.

.W WI 6oz ml 1H T @FT@ COMBINATION-CLAMP.

Specification of Letters Patent.

Patented June 12, 1917.

Application filed November 27, 1916. Serial No. 133,676.

To all whom it may concern:

Be it known that I, STEVE BULLUM, a citizen of the United States, aresident of Tulsa, in the county of Tulsa, State of Oklahoma haveinvented certain new and useful Improvements in Combination-Clamps, ofwhich the following is a specification.

This invention relates to that class of clamps used for connecting thecable or rope to the rocking arm of a drilling machine.

The object of this invention is to provide a clamp of this character ofsuch construction as to enable the use of interchangeable slips, wherebyit is possible to utilize the same clamp for either steel cable orManila rope, by substituting suitable slips.

Another object of this invention is to provide slips or gripping memberswith means for permitting their adjustment either axially or verticallyto permit ready interchange of cable or rope.

Reference will be had to the accompanying drawings forming a part ofthis specification and wherein like numerals of reference designatecorresponding parts throughout the several views, in which,

Figure l is a side view of the device.

Fig. 2 is a top plan view.

Fig. 3 and Fig. 4 are both top plan views of the various forms of slipsor gripping members.

Fig. 5 is a perspective view of one of the gripping members.

Reference numeral 1 indicates a conventional clamp consisting of twojaws 2 and 3 suitably hinged together as shown at 4. The gripping facesof these clamp members are semi-circular in cross section and arebeveled inwardly to correspond to the tapering slips or gripping members5 and 6. A hinged screw threaded bolt 7 is secured to one of the jaws bymeans of pin 8 and is adapted to engage a slot 9 in the opposite jaw.The thumb screw 10 is provided to engage said threaded bolt 7 forlocking the jaws together.

The gripping members or slips 5 and 6 are adapted to be arranged withinthe jaws 2 and 3 of the clamp and .are of semi-circular cross sectionand gradually taper downwardly and inwardly to form when in theirrelative normal positions a truncated cone shaped unit. The upperextremities of the slips are provided with shoulders 14L for engagementwith the upper faces of the clamp aws.

To permit axial movement of the slips and to limit such movement thefollowing arrangement is provided: Two bolts 15 and 16 provided withhooked upper extremities are arranged in the upper faces of the clampjaws 2 and 3. Links 17 and 18 are arranged to engage said hooks andconnect with the operating lever by any suitable or conventional means.Two elongated U-shaped guideways 5 and 6 are formed just above theshoulder 14 and through which the said bolts 15 and 16 pass. Theseguideways may be formed integrally with the said slips by casting or maybe constructed of suitable metal and afterward attached. In eitherinstance they are provided with radiating ex tensions 19 and 20 whichform handles adapted to be engaged by the operator in placing orreplacing a cable or rope.

Various sizes of slips or gripping members may be provided for engagingeither Manila rope or steel cable. In instances where it is desired touse steel cable, because of the varying sizes of such cable it will benecessary to utilize a lining of steel or other suitable metal such asindicated by reference character 21 in Fig. 3. This lining will besecured in position by means of suitable screws.

In use, as previously set out, this clamp is attached by properconnection to the operating lever and grips the drilling cable or rope.The slips or gripping jaws, which will be selected according to the sizeand type of rope or cable used are arranged in position, i. 6., areswung from open to closed position by virtue of their guideways andattendant bolts. These slips are then lifted vertically to permit theclamp jaws to be closed, and when the latter are closed the slips arepermitted to drop and because of their tapering outer faces andcorresponding inner jaw faces quickly and firmly grip and bind the cableor rope. When the cable is to be released the jaws are unlocked andopened and the slips are swung on their guideways backwardly toward thehinge of the clamp jaws. The cable or rope is then free to be readilyand easily removed. Particular attention is called to the quickness andexactness with which a cable or rope may be placed or removed oradjusted and also to the exceptional gripping capacity of the clampingdevice because of the novel construction and arrangement of parts.

Various changes in the details of construction and arrangement of partsmay be made Without departing from the spirit of the invention or thescope of the claim hereto annexed.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

retention thereof in clamping position, gripping members positionedWithin said jaws and having guide-Ways projecting laterally therefrom,bolts extending from said jaws through said guide-Ways, said grippingmembers being provided With shoulders engaging 'the ends of said javys.

STEVE BULLUM.

Washington, D. G

